Detect and handle corrupted saves

[ceruleanskis]

Need to be able to detect corrupted saves and handle them. Right now, corrupted saves crash the game. This seems to stem from the load menu attempting to parse the save game info in order to display it.

Example of a corrupted save attached.

Traceback (most recent call last):
  File "mygame/main.py", line 89, in <module>
    raise err
  File "mygame/main.py", line 80, in <module>
    run_game()
  File "mygame/main.py", line 62, in run_game
    active_scene.handle_input(filtered_events, pressed_keys)
  File "mygame/scenes/menu_scene.py", line 67, in handle_input
    self.take_menu_action()
  File "mygame/scenes/menu_scene.py", line 86, in take_menu_action
    self.switch_scene(load_scene.LoadScene())
  File "mygame/scenes/load_scene.py", line 26, in __init__
    self.menu_items = utilities.save_manager.SaveManager.get_save_list()
  File "mygame/utilities/save_manager.py", line 38, in get_save_list
    json_data = SaveManager.load_game(path, import_seed=False)
  File "mygame/utilities/save_manager.py", line 81, in load_game
    json_data = json.load(json_file)
  File "/usr/lib64/python3.9/json/__init__.py", line 293, in load
    return loads(fp.read(),
  File "/usr/lib64/python3.9/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python3.9/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python3.9/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 22 column 16 (char 398)

Process finished with exit code 1

data_6.save.json.zip